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5 March, 23:12

Two methods, A and B, are available for teaching a certain industrial skill. There is an 80% chance of successfully learning the skill if method A is used, and a 95% chance of success if method B is used. However, method B is substantially more expensive and is therefore used only 25% of the time (method A is used the other 75% of the time).

Required:

a. What is the probability that a worker will learn the skill successfully?

b. What is the probability that Method A was used?

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Answers (1)
  1. 6 March, 01:44
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    a. The probability that a worker will learn the skill successfully is 0.8375

    b. The probability that Method A was used is 0.716

    Explanation:

    a. In order to calculate the probability that a worker will learn the skill successfully we would have to use the followinf formula:

    probability that a worker will learn the skill successfully = 0.75*0.8 + 0.25*0.95

    probability that a worker will learn the skill successfully=0.8375

    The probability that a worker will learn the skill successfully is 0.8375

    b. In order to calculate the probability that Method A was used we would have to use the following formula:

    The probability that Method A was used = (0.75*0.8) / 0.8375

    The probability that Method A was used=0.716

    The probability that Method A was used is 0.716
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